| 摘要 |
<p>Systems and methods for maintaining cell transmissions at or above the minimum cell transfer rate for ABR-category VCs. An ABR schedule table (AST) (200) in a memory stores ABR VCs scheduled for transmissions. A pointer (225) to the AST indicates that the ABR VC currently addresses is ready to transmit a cell. The schedule pointer is incremented every cell transmission time. When a cell of a particular VC is sent, the VC is rescheduled in another time slot (100) such that the next cell for that VC is transmitted at close to or equal to that VC's allowed cell transfer rate (ACR) while maintaining its minimum cell transfer rate (MCR). To determine the next time slot in which to reschedule the VC, the system uses an ACR bitmap (250) that compresses the AST and which identifies entries that are not occupied by a VC scheduled for a transmission.</p> |
